Mathematics × Programming Competition #7
21/9/2017 UTC 04:00 - 28/9/2017 UTC 04:00
For Chinese version please scroll to the bottom. 中文版請見文末。
Question
A point is chosen randomly in a square. 4 lines are drawn to connect this point with the 4 vertices of this square, such that 4 triangles are formed. Find the probability that all interior angles of the 4 triangles are less than 120°. Give your answer correct to the nearest 3 decimal places.
Answer submission
Please submit your answer through this link.
Rules
- This competition will last for 7 days. After that, no more submission will be accepted.
- Participants who submit the answer as a comment below this post will be disqualified.
- Participants can submit an unlimited number of solutions, however only the latest answer will be considered.
- You have to upvote this post in order to be eligible for the competition.
Prizes
- The three fastest contestants would win the first prize, second prize and third prize respectively.
- Other contestants who gave the correct answer would enter a lucky draw. 5 winners will be drawn.
- Those who resteemed this post will have 400% higher chance to win in the lucky draw.
- @kenchung reserves all the rights to disqualify any suspected cheating players and to decide the distribution of prizes among the winner(s).
| Name of prize | Max no. of prizes | SBD | SP (sponsored by @steemstem ! ) |
|---|---|---|---|
| First prize | 1 | SBD payout of this post / n | 7.5 |
| Second prize | 1 | SBD payout of this post / n | 5 |
| Third prize | 1 | SBD payout of this post / n | 2.5 |
| Consolation prize | 5 | SBD payout of this post / n | 0 |
where n is the total number of winners in this competition. n = min (number of participants getting the correct answer, 8).
The steemSTEM project (@steemstem) is a community-supported project aiming to increase the quality and the visibility of STEM (STEM is the acronym for Science, Technology, Engineering and Mathematics) articles on Steemit. Please support steemSTEM by following @steemstem and joining the chat channel. You can also consider joining a private curation trail to further support steemSTEM by asking about it in the chat channel. In order to further promote the use of the chat channel, I will stop announcing the time of next competition via a post. Instead I will announce the time in advance in the chat channel!
數學 × 程式編寫比賽 (第七回)
21/9/2017 UTC 04:00 - 28/9/2017 UTC 04:00
問題
在一個正方形內隨機選取一點，並將此點與四個頂點連上直線，從而將正方形分割為四個三角形。求四個三角形之中所有內角均不超過 120° 的概率，答案準確至小數點後 3 位。
答案提交
請經此連結提交答案。
規則
- 此比賽為時7天，其後將不會再接受新答案。
- 嚴禁在回覆公開答案，否則將被取消資格。
- 參加者可以重覆提交答案，但比賽終結時只會考慮最後提交的答案。
- 你必須upvote此帖方能參加比賽。
獎品
- 最快給出正確答案的三名參賽者將分別獲得一等獎、二等獎和三等獎。
- 其他給出正確答案的參賽者將可參與抽獎。5名參賽者將被選出。
- Resteem此帖文者將有額外400％的得獎機會。
- 本人保留一切最終權利，包括但不限於取消任何疑似作弊者的資格並決定獲獎者的獎勵分配。
| 獎項 | 獎項數目 | SBD | SP (由 @steemstem 贊助！) |
|---|---|---|---|
| 一等獎 | 1 | 此帖文的 SBD 金額 / n | 7.5 |
| 二等獎 | 1 | 此帖文的 SBD 金額 / n | 5 |
| 三等獎 | 1 | 此帖文的 SBD 金額 / n | 2.5 |
| 安慰獎 | 5 | 此帖文的 SBD 金額 / n | 0 |
其中 n 是本比賽中得獎者的總數。n = min (答對人數, 8)。
steemSTEM（@steemstem）是一個由steemit社群支持的項目，旨在宣傳STEM（STEM是科學，技術，工程和數學的首字母縮略詞）。 請追蹤 @steemSTEM 以及加入聊天頻道來支持steemSTEM。你還可以透過加入自動點讚系統來在為了進一步支持steemSTEM，詳情請在聊天頻道內向負責人士查詢。為了推廣聊天頻道的使用，我將不再透過發文來宣布下一場比賽的時間，我會在聊天頻道中提前公佈比賽時間。
I hope i win this time :P (voted and resteeeeeeeeeeeeeeeeeeeem)
sure best of luck! :p
Just to be sure, if my solution would be 0.55%, I should submit 0.006.. correct?
(that is not my solution btw 😼)
yes that's right :)
读到题目就头晕了😩
😢😢😢
business does not lie to results
Just submitted the answer.. It's a very difficult one.
ye this one is more difficult than the previous questions :) hope that you got it right!
来晚了，睡醒了已经发布好几个小时了。。。不过还是参与一下吧。争取幸运奖！
多謝支持啊 :)
我也谢谢你，这个游戏 好有趣，我超级喜欢。
This is actually some astounding work! Followed
好難呀呀🙈😂😂
這次是真的比較難和複雜的，不過只需用上中五的知識就可以解答的了！ ;)
确实是好难呀，比1公斤鱼难好多。
计算方法有限制吗？是否一定要编程实现？
解決方法不限，提交最終數字答案即可
I have also submitted my answer, both in unit-less and percentage form in addition to the exact solution if that is ok
Hopefully without computational errors ^^
3 decimal places in the unit-less is fine :) anyway thanks for your participation! hope that you got the right answer :)
我就想问答案要发在哪里
上文有連結提供的啊
「答案提交」那一部分
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雖然不懂⋯也要支持！！😂
謝謝啦! :)
希望可以得獎!
謝謝參與，希望你能得獎！
Hope I got the answer :)
Awesome math puzzle! RESTEEMED!
great thanks! :) hope that you can win :)
這個比賽不錯，數學方式我可不懂了，不過看來編程應該不難的
支持一下!
謝謝支持!
cool contest. I will try to tackle it when I get some free time.
sure! :) thanks for joining!
submitted... Will make a post about finding my result once the contest is over, as I'm sure it may be a somewhat different approach :)
thanks for participation, looking forward to seeing your approach in solving this question!
等待结果
這幾天比較忙，可能要遲數天才公佈，要耐心等候一下啦～
i have published a post here: https://steemit.com/cn/@vincentyip/kenchung
please check it out! :)
great I was not able to read this 7 days ago
never mind, remember to join the next competition! :)
great post i upvoted you & follow you please follow me & upvoted me